Granted Patent
Utility
US 5,730,921 · App. 08/414,421
Co-molding process for producing refractory materials without firing or coking the refractory
Inventor:
Richard Hall
Patented Case
View Patent ↗
Granted: Mar 24, 1998
Filed: Mar 31, 1995
Inventor
Richard Hall
Assignee (at issue)
NORTH AMERICAN REFRACTORIES COMPANY
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.